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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1707c5538c0cfe53f56931055b8059969b5d934cdd131ba729a8e3fa7b17ba03' 
  AND token = 'om0bUOHSFQlN0ck7q+1J6QauliFfhTyaeWAWqLnja+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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