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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884e34ab536c1cb74b6f81e670b73682c3b2435b54b5cfde022959380dff35b7' 
  AND token = 'IBOboYOME3IWyogWOinS39jwwcfZbm6/3JdTDah0kyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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