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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bce26425d82ed9f0d7206f5c9f209e0c5a6330789093adab5ca6a46a954f366' 
  AND token = 'W2c1gzBVP5vxSX3XeqZzpryj+LigFcuIfbBK7Ebfg7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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