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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3367411738d24f7dac84528c630c6c98fa1cdc9cfd5a8ac9760567b9a2a64459' 
  AND token = 'p3wSebATK4fpoNFWAuPBrNtmx9UAQYs1ZlLVkresnXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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