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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9aa15fe86dd86e4d46b3da5a21b3002e747f1fdd54f8526e14abd1e13e8c79' 
  AND token = 'Zo/F73aq4a9Cx2U3fYb/mxVTnfmVIwQOBzq5wqUWENE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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