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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cdb9032cf368543f037545d29dfd49fe17e07deba2be333f21473acba372a7' 
  AND token = 'h/Y3JNbb0fa4BQG5UIxwfBp82tciuAZ8Eto/RsOQHnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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