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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83901e6df3a5f141cd7bf00abbbc41fb0f01a6285d540ff089b6e6dc328ffccf' 
  AND token = '7fLJ/0sw4L6zCdZvFQEOYbiEf9b6AkmAph1ISDq0Xds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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