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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3aafe425b87fd0bebf091614e83682a61ba9b56d1f6dfc991265e5caf8d085c' 
  AND token = 'BTM8Ky8vZet7/bMAFgaOliPO80QiwicdeElJU2M3Qvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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