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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46e40ec254e9c4622d055e4591759b18109d4f2507fa5404027d6eca643c88a' 
  AND token = '8rtfqsSmkyuZ6ghA8g7BRqYWXKT6IJ4b/IW7asgeCEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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