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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb3af33916e5e8e30c7217918d70a6ce8890f1ecd8128975980f9e25f9bcb80' 
  AND token = '3blnscZqsmC2WslfY7D1+Zbe843LU+Dngh8JgEDFBnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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