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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67f66212e1d30f2555eb10faaf699b4f442ed90c2069dcf0af3fd15321736ec' 
  AND token = 'DK1cpE1iDONldnkGJcKig51o0yTl1Ol8XJx7Svggjec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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