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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2eb1cec778da4d0d2862ed5f7ab3127d2c93172121e14d1f960c0e02e4ecc97' 
  AND token = '87KWt/zJb0to6sP4EIs7CKBVcRMKysD9Zru2sWKN7N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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