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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed9a0a29024a52027e2c7300a098a396cdf8c4a51116382ab81ca3c12549497' 
  AND token = 'XZ8RJPi0YKD7eitvXAdE3hkELPBow3ojlgPC7mrM80Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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