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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f542b31216c4bae084f22088d617c06a6c3b647a5bd950cf1be55be687722df1' 
  AND token = 'Nej+b5kOHbSvz2zhDSko8daJMPt291NSq7nZw3x4ThA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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