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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d25296b81ef45054aeda3795fd40f69cd1cffe01c682b97ce2853cfe0100770' 
  AND token = 'Jy3tlv3zxk1mGwrgz7qIXuS9EJ9QZwYAU234sadYBSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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