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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af7a4c3da7295c4da5421df65587141b3c9a689c1a3e15d89d1f2f03e1c554d' 
  AND token = 'Jo+CFFAvi2d6y/70JaisMaLdw7Xup05lmeg1F8xzANw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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