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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6283da34503b5e2d0751e1a4c117df228e91c73a59167829b52bf610ada1c2b0' 
  AND token = 'Ocu12AzwEA/YesW1VDO6Aosih771QXo9RZQrStavSig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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