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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7e6d1a89f9603b72395f11a72390f52d0a6d0536680dd79e66a74c5702fa0d' 
  AND token = 'Vbad0921BUGKPQATFOvt2/nIelYaNUkLVwp/TvZrmdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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