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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd3dec6d24f4de4bcdf81e860e89ea3df6a49d264ad265819f97dca49b26873' 
  AND token = '74S/n5WX6NslHlyFkzMPsiAj74/mLKUng/RMievwAk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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