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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01857c27894ff3786d677d07514401044a36b13e187c144f19c98260ce1f9cdb' 
  AND token = '1F8t9W6CaiEvlaDGYCbn372r6KgYkPwPmJFz5CASQSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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