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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5987b2faf75f50888e04626612717e1a22d4db47087ad0339053fa0baced664' 
  AND token = 'FauXOaVWxoAmQNypxDWJOLeOlL6jeDCSI/AnB51eubE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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