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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c806824a92ec5481d34e56db4e3820ae264ecc7a7a94540f649727cc4a9ac13' 
  AND token = 'th7DS4nYxJy4NU+XDtwZgwxNvdBN1qkMXlKTOgQsa4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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