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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd88024d885ed7e1751feed0d0870cd90a17f51e88e5c8c316695f0018e7e5e' 
  AND token = 'SG3qhrry40zPzGo+GKPTwd7gyqd5Tnj8mPzFhDN9ekY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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