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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe28fc351be97b39cb76c608b7fd21224f34c1d0dd87fb94cd2b8666b53104e' 
  AND token = 'cAeKcmFtftBobp9cANY5AsGsE//9pTZ92KZMoa+Dnpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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