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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3854cecd8ba0d532c73edba906404a0acb4554a3a80c2c35f9556780b105f4f3' 
  AND token = 'NPNDXzvDGXHedrsAixjaEtr7f7V0Mt6lNr3i+eo/eyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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