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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a518e4fe15557d643e569c1e8cd3394962ba64ee51a62162f3ba6c9e435f882d' 
  AND token = 'SY9FyMY/lnc+edxvn3s15v93zCo6YTg8CbGIHyBHS0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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