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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1a5122c4d5bf49609f1c287ec10e0c0093b87845694847fe2589be83a08e80' 
  AND token = 'YIqNE84CkzcI/74jr9I0ULBexQDGzUygfW3LZ5wW00w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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