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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70071e470a0eaf408371d3776703bd58b1a30a203d798053ded5a3b747d2f1bb' 
  AND token = 'ct5KVlPzBN5gGqCVZRxGM9ENW+v4xjZX51DqldZxB28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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