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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c46de42ed25027dfae49c1c0a1c7473cfa3c2961ad093a76be6594a5e3d5175' 
  AND token = 'n7X2NIWnepMgSyYuDrgtKy14UXExxfzQ1ENejulvwx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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