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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2587c8d99c3aa1bcded1ba8fd7bf35b0b53212b939b55f6820964037827323' 
  AND token = 'Uh5L1SS0Y+cnO/JQ9kk4ASU7fS8YxnRqznRcZsdQ30c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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