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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f5a0d1344483469e9e6f3946608dd6eb046b9b88bb60266ffca8ed98d037ce' 
  AND token = '6gjN9z/3k9pmvmAfARMvn7+BtjqAHBn99L3lqxiQWyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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