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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8faf8b74609154c65479f49612ca5da3a0a947ad41da360e2d5292f48226982e' 
  AND token = 'XVQRoc0HmfLo21OzRo3KSfctcLD1F90pfuc8P3ggAHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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