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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b40048a283b00b5a173630fad3b2cedd38d017d7025b935b0e83d005ec97b2' 
  AND token = 'NDi3oiTnkX12QqHiAOsG9wInM078TT1m5xp224DSWC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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