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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8d35761ea6da66597915cd9a08052f35ed2b7df45605a9ced92b81d28c6524' 
  AND token = 'bEn2ywtOslMos33GLe6EQkMyI1fHoba0vhKswo4nDT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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