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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d32d9535ace9ecffa11e79b4e731dddcf7347b8cc4604657b2f4d6b0a9e1cf' 
  AND token = 'oEgUUDfZiUhVpyjNbiJQwkGZx1aVGHrpcg39TgulOao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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