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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf2469cb9c430e52ac964eaf8dfbd2bce8a1d467d0419e4b4e8d7677365978f' 
  AND token = 'Clvce6aTCQlb0MkIpUIs36Fa6ilJpeyQAXsyb3uKNds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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