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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0413721dc62cc195b461dc341eab8db815581d947087631de7db233fca2bc7a6' 
  AND token = '2BGMjo9R7t8nSDMspB02559uOF69bEV/VKFo4U+v0UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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