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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec4c2b57f31abf7e2c571b9ae8d5d8cbca40e5c39b7c375291e7cbe74985cc5' 
  AND token = 'YZ4gaUTmzckXbjbHXYHrO2RVSZiLWRbD0P5TVfzzbNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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