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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050bf35356f93ef1dd8076da976043d54220a00d7b9a74a03fba5db38402a779' 
  AND token = '8d8bc78za24VORJW3Qfvcq0eGlLG2mYoLi+6kG7dJkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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