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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe41a73a0248329ba2f2a9e663d1ae9408815a7171c66128f08d891000c5a01' 
  AND token = 'uIDPR3TuOkAY7Ta15zaSie4nNEhlV2p+Otrdr3k20P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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