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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6265c461857ab495f6b73c51d74c372b0f6ae68cd9c4f05e04cfd98138e9bb' 
  AND token = 'THHXYTzgSsnbQoIizEcZP+tw9t77NsaJYf9jOlimJWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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