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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2264f47926cccee30c55a4bd5058864ed147b7890f2d9154c2dd83a90adc0039' 
  AND token = 'FaNibh1QUHHXbwCCsFItdN4ZvGsU2eS7n6JzoqRGabo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}