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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3badc16df03f047a53268bc25738934530a00cb6759acc19735d3d4f90836d' 
  AND token = '50x8iOPnaF2bnxZEFct1zvxhtkXJl98wGTBgKUveWxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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