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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3a0537d1ff0d2f72b5ffcedd62623db36c2ac645dfacbca30659b9558f4907' 
  AND token = 'C/boeZQ/1EKnD8dAjs7pYD3QRdq75tNZXOf4meGVEQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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