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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39248ab6be45269f2c5ce8ed5bde5e245953e70877c9e63a44ce10ad466027f2' 
  AND token = 'Lnb94wXxTwoH2C4a2Lq29MLJun9BYdjmt3oN97r6YxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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