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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104fdfaaf4d14fbacd1128f447319514801b9e737ca7e8efd0bfbb5231883de6' 
  AND token = 'b9MJ1K/A19hrc77TqlLpPYwwoHAdd/i4p8Knk49d/OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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