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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0388557ac0c8a5404c4246b833ceb62d7fe0568ef272f2f74a810c43d5745ba2' 
  AND token = 'trBEecZoOVo+ckEmfkDxo9vChZKsE/FPv/T/I8Ykci4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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