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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796a646497b3fc6c83e441b17ef9391c6b30904b02c59367d7e42b0a89dcf791' 
  AND token = '5x9niT/N2RlYCJXrpp+clvpI6htZblRKkDdYXqO6g2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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