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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb67afe5f7222ebe0ee1195cad7348e0676ed15f04b5aed442d856c9d995a50' 
  AND token = 'LJ7kOkQmEcQdxr2JEYpf8JE/MckAeNJNcpEUm39vnek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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