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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06312a48d95a9a7aac517629877d4a24c98d68e018659a91478a0ca364957bd' 
  AND token = 'f90MGjQC3JKGnlvlfPEYZfSunSFeV+7kfTOB6fQvIpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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