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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13fe338b89ad8af3035bd93dccbe6549319a1cad4971f4acd654a483c79e4da' 
  AND token = 'qVAGjMO5pbJ6VU03+9C1v5i4Epd6s7jQhrwvCp3qbHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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