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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632fef54ad2356d22f2f6c04473760e963ac494006b93f79e27507dcf3014b4d' 
  AND token = 'TvBPoiYNU0uA4D3p5P8Y21rNIYtsFPeURHgiQqf0uss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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