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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab319268799c656f853d2ded17437dc0a9fad8baf4a74e96135a097fedac6f7' 
  AND token = '0dvMcQd1RA/l2j7Ll4HCDGeYowHzi1nf1AyiaZZ+SM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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