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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2698dfd3d38e36f8d355e5b9a13e6eed5b0742a50ce900ea616492182d6e8994' 
  AND token = 'JMOcK/dU9j+YIVAMblr+CFKYjS09MMn+dNBKXvcj5AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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