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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f33ad902ef1dae117f220c8d2d244a771f9a87374031711508f62ec2a0a860' 
  AND token = 'wfSAS9mH68waUuJRORyt5+TVf+gk6haYPE0a7KQJ45s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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