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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dbd9a6fb40c4d6eac5b4dc1f3b5c2e9dda350c3e7c7c61c15a611e3e5c73fc' 
  AND token = 'iU9ZZV9J2R/QBtXNKxl4cZmAQsNCvArlLXJkC74cguo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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