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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ba47d8edb72906ea077b016fcfed58c1c121907e292b1ece0f3777addc562a' 
  AND token = 'hFnMObYpc7MoW265WJhjKGSW2x65/sBPzICpWy34/J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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