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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a8d768131f459d54cb6c0db7d5743bb172a06a67e514b4f4ba75ea631ff886' 
  AND token = 'zOx6uMiLsRLKhxa0B4pZ0t4Kqyh2xnDWTYwG0zPWflQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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