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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408304512749f98d4a0b4147ce5b67f3bb4d6e10d7a9f33066fa5443c11ae408' 
  AND token = 'Q5XpEVhdHtg/nnWXoXqa0QqmEWdLRtKdnIek0/LKIXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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