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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b03c53fca6b6ae707ca7c1ae567fa1d4901be8e5c79a08346b909ef1b3f2ad' 
  AND token = 'I2EOUlDJjQaPYqd6Hspnn2+9d4I3uXLUiVsjLeuMvA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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