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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f2ac263e1c203cdb1e66e9c1c9c8f0f39676a03eb4c3e96f69099e247ce8b1' 
  AND token = 'tXqycFUOyetklWDQJNRffz6P6HMC/Mzw2kygoTyLmiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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