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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09da7cb85e71b827e7eeb1e742bee5a7e2264322a0b8ae9bd27e3c6ea140dff3' 
  AND token = 'pFsYo6xzIaLTQ9ham2DcIPbZBjhDW9MdADYaAsL3Qns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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