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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed736f69961318ca421b21729d7019258f5285669ba384a7faae20346dc03d7' 
  AND token = 'q0AjJaOGR1LWAVNn1pcOSeIIL4mC3q2CPm18imO5DE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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