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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9762ef54781b94b6a13c694c0cbc631105a255f460d6146f58d074328013b3d7' 
  AND token = '43w5qGxZ99WhWk9EcDFDt1oN2pKR3KpzkYkWEkIk9sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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