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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662c43a417946b9cd50865faddecaa291e9ef2ad71383fe038ee6ab8b5191a33' 
  AND token = '4JfEj6q2PT4sJlhmUgI5K6atimzO9AncM3rZc8v1LMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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