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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73e9439971ae9a10dfec02f11851328740de604359ee3d8fed0a494ac1b9d9a' 
  AND token = 'qn6OR3QvjuMVpFT6FtFBVN6dcDeD+OzFkwTrMnMIR4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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